<pre>  /**
   * The constants used in this Content Widget.
   */
  public static interface CwConstants extends Constants {
    String cwPluralFormsExampleArg0Label();

    String cwPluralFormsExampleDescription();

    String cwPluralFormsExampleFormattedLabel();

    String cwPluralFormsExampleLinkText();

    String cwPluralFormsExampleName();
  }

  /**
   * The {@link TextBox} where the user enters argument 0.
   */
  private TextBox arg0Box = null;

  /**
   * An instance of the constants.
   */
  private final CwConstants constants;

  /**
   * The {@link Label} used to display the message.
   */
  private Label formattedMessage = null;

  /**
   * The plural messages used in this example.
   */
  private PluralMessages pluralMessages = null;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    // Create the internationalized error messages
    pluralMessages = GWT.create(PluralMessages.class);

    // Use a FlexTable to layout the content
    FlexTable layout = new FlexTable();
    FlexCellFormatter formatter = layout.getFlexCellFormatter();
    layout.setCellSpacing(5);

    // Add a link to the source code of the Interface
    final String rawFile = getSimpleName(PluralMessages.class);
    Anchor link = new Anchor(rawFile);
    link.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        fireRawSourceRequest(rawFile + ".java");
      }
    });
    HorizontalPanel linkPanel = new HorizontalPanel();
    linkPanel.setSpacing(3);
    linkPanel.add(new HTML(constants.cwPluralFormsExampleLinkText()));
    linkPanel.add(link);
    layout.setWidget(0, 0, linkPanel);
    formatter.setColSpan(0, 0, 2);

    // Add argument 0
    arg0Box = new TextBox();
    arg0Box.setText("13");
    layout.setHTML(2, 0, constants.cwPluralFormsExampleArg0Label());
    layout.setWidget(2, 1, arg0Box);

    // Add the formatted message
    formattedMessage = new Label();
    layout.setHTML(5, 0, constants.cwPluralFormsExampleFormattedLabel());
    layout.setWidget(5, 1, formattedMessage);
    formatter.setVerticalAlignment(5, 0, HasVerticalAlignment.ALIGN_TOP);

    // Add handlers to all of the argument boxes
    KeyUpHandler keyUpHandler = new KeyUpHandler() {
      public void onKeyUp(KeyUpEvent event) {
        updateMessage();
      }
    };
    arg0Box.addKeyUpHandler(keyUpHandler);

    // Return the layout Widget
    updateMessage();
    return layout;
  }

  /**
   * Update the formatted message.
   */
  private void updateMessage() {
    try {
      int count = Integer.parseInt(arg0Box.getText().trim());
      formattedMessage.setText(pluralMessages.treeCount(count));
    } catch (NumberFormatException e) {
      // Ignore.
    }
  }

</pre>